package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import java.lang.reflect.Method;
import java.time.LocalDate;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j

public class AutoFillAspect {
    /*
     * 切入点
     * */
    @Pointcut("execution(* com.sky.mapper.*.*(..) )&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}



/*
* 前置通知，用于公共字段的赋值
* */
@Before("autoFillPointCut()")
public void autoFill(JoinPoint joinPoint) {
    log.info("开始进行公共字段的自动填充...");

    //获取到当前被拦截方法上的数据库操作类型
    MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
    AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
    OperationType operationType = autoFill.value();//获取数据库操作类型

    //获取当前被拦截方法的参数-实体对象
    Object[] args = joinPoint.getArgs();
    if (args == null && args.length == 0){
        return;
    }
    Object entity = args[0];
    //准备赋值的数据
    LocalDateTime now = LocalDateTime.now();
    Long currentId = BaseContext.getCurrentId();
    //根据当前不同的操作类型，为对应的属性通过反射来赋值
    if (operationType == OperationType.INSERT){
        try {
            Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            //通过反射为对象赋值
            setCreateTime.invoke(entity, now);
            setCreateUser.invoke(entity, currentId);
            setUpdateTime.invoke(entity, now);
            setUpdateUser.invoke(entity,currentId);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }else if (operationType == OperationType.UPDATE){
        //为两个公共字段赋值
        try {
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setUpdateTime.invoke(entity, now);
            setUpdateUser.invoke(entity,currentId);

        } catch (Exception e) {
        e.printStackTrace();
        }

    }



}
}

